Calibration for
capacitance probes
Step Matrix Entry Significance
1 V9H5 671 Reset transmitter
2 - »E« Register entry
3 V8H0 2 Select level switching mode
- If 0 is entered, both level measurement (channel 1)
and level switching (channel 2) is possible
4 - »E« Register entry
5 V8H4 1 Set sensor type to capacitance probe
6 - »E« Register entry
7 V8H6 e.g. 1 Set switching point in Hz (build-up compensation)
-1 Hz
≅
5 pF, see Table 8.1
8 - »E« Register entry
9V8H5
Either
0 Calibrate with exposed probe
10 - »E« Register entry (frequency stored at V1H5)
9V8H5
or
1
Calibrate with covered probe
10 - »E« Register entry (frequency stored at V1H5)
11 V1H4 2 If appropriate, assign relay 1 to channel 2
- Enter same values in V1H0/V1H2 as are to be found at
V1H5/V1H7
12 - »E« Register entry
13 V1H1/V1H6 e.g. 0 Select fail-safe mode
- 1 = maximum (default), 0 = minimum
14 - »E« Register entry
15 V8H2 e.g. 2 Set relay switching delay in seconds (default = 1 s)
16 - »E« Register entry
Note!
• At step 9, always press button »E« even if the correct digit has already appeared in
the display.
• The value in field V1H7 must be less than that in V8H6 otherwise the relay will not
switch correctly
Product Dielectric
constant
ε
r
Conductivity Switching point
with ground tube without ground tube
Solvents, oil, fuel <3 low ca. 150 mm ca. 500 mm
dry bulk solids <3 low ca. 350 mm
(cable probe)
moist bulk solids >3 medium ca. 150 mm
(cable probe)
aqueous liquids >3 high ca. 30 mm ca. 30 mm
Table 8.1:
Switching point adjustment for
default value of 1 Hz = 5 pF as a
function of product
Silometer FMC 671 Z/676 Z Chapter 8: Other Applications
44
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